Question:medium
A BJT in CE mode has \(\beta = 120\) and collector current \(I_C = 2.4\text{ mA}\). The small-signal transconductance at room temperature (\(V_T \approx 25\text{ mV}\)) is approximately
A BJT in CE mode has \(\beta = 120\) and collector current \(I_C = 2.4\text{ mA}\). The small-signal transconductance at room temperature (\(V_T \approx 25\text{ mV}\)) is approximately
Show Hint
The transistor current gain parameter (\(\beta = 120\)) is extra information not needed to solve this problem! BJT transconductance is unique because it depends only on the collector current and thermal voltage (\(g_m = \frac{I_C}{V_T}\)).
Updated On: Jun 25, 2026
- 0.024 S
- 0.048 S
- 0.096 S
- 0.12 S
Show Solution
The Correct Option is C
Solution and Explanation
Was this answer helpful?
0
Top Questions on Transistors
- A square metal sheet of 4 m \( \times \) 4 m is placed on the x-y plane as shown in the figure below. If the surface charge density (in \( \mu \)C/m\(^2\)) on the sheet is \( \rho_s(x, y) = 4|y| \), then the total charge (in \( \mu \)C, rounded off to the nearest integer) on the sheet is _________.
- GATE EC - 2025
- Networks, Signals and Systems
- Transistors
- The electron mobility \( \mu_n \) in a non-degenerate germanium semiconductor at 300 K is 0.38 m$^2$/Vs. The electron diffusivity \( D_n \) at 300 K (in cm$^2$/s, rounded off to the nearest integer) is _________.
- GATE EC - 2025
- Networks, Signals and Systems
- Transistors
In the circuit shown, the identical transistors Q1 and Q2 are biased in the active region with \( \beta = 120 \). The Zener diode is in the breakdown region with \( V_Z = 5 \, V \) and \( I_Z = 25 \, mA \). If \( I_L = 12 \, mA \) and \( V_{EB1} = V_{EB2} = 0.7 \, V \), then the values of \( R_1 \) and \( R_2 \) (in \( k\Omega \), rounded off to one decimal place) are _________, respectively.
- GATE EC - 2025
- Networks, Signals and Systems
- Transistors
- In an n-p-n common emitter (CE) transistor the collector current changes from 5 m A to 16 mA for the change in base current from 100 μ A and 200 μA , respectively. The current gain of transistor is Options 1. 110 2. 0.9 3. 210 4. 9
- JEE Main - 2023
- Physics
- Transistors
- Want to practice more? Try solving extra ecology questions todayView All Questions